Update pytest from 3.8.1 to 3.9.3

pyup-bot · pyup-bot · commit f1d1d63aa8a4 · 2018-10-27T21:55:14.000-07:00
diff --git a/requirements_dev.txt b/requirements_dev.txt
@@ -8,4 +8,4 @@ coverage==4.5.1
 Sphinx==1.8.0
 twine==1.11.0
 sphinx_rtd_theme==0.4.1
-pytest==3.8.1
+pytest==3.9.3
